饼干在Laravel不起作用？

When a new user visits my site I want to redirect them to /welcome but only once, I thought to do this I could use cookies and set a cookie forever once they had visited the welcome page and then checking if the cookie existed before sending them to /welcome.

Here I have a base controller

class BaseController extends Controller
{
    public function __construct(Request $request) 
    {
        $this->checkWelcome($request);
    }

    private function checkWelcome(Request $request) {
        $currentRoute = Route::currentRouteName();

        if ($currentRoute != 'frontend.guest.welcome' && Cookie::get('visited_welcome') != '1') {
            header('location: ' . route('frontend.guest.welcome'));
            exit();
        }
    }
}

When sending to frontend.guest.welcome it has a route to WelcomeController

Route::get('/welcome', ['uses' => 'WelcomeController@getView', 'as' => 'frontend.guest.welcome']);

Here is WelcomeController

class WelcomeController extends BaseController
{
    public function getView()
    {
        Cookie::forever('visited_welcome', '1');

        return view('frontend.guest.welcome');
    }
}

The issue is, its constantly sending to /welcome, not once but always.

You aren't returning the cookie with the response, attach it to the response like so:

public function checkWelcome(Request $request) {
{
    if (!$request->cookie('visited_welcome')) {
        return redirect('frontend.guest.welcome')->withCookie(Cookie::forever('visited_welcome', '1'));
    }

    // otherwise proceed as normal
}

Alternatively, you can use the queue method on the Cookie facade:

Cookie::queue(Cookie::forever('visited_welcome', '1'));

https://laravel.com/docs/5.5/responses#attaching-cookies-to-responses

A better approach may be using middleware, that way you wouldn't need to implement any check in your controller code. For example:

// CheckIfFirstTimeVisit.php
public function handle(Request $request, Closure $next)
{
    if ($request->cookies->has('visited_welcome')) {
        return $request($next);
    }

    return response()->view('frontend.guest.welcome')
                     ->withCookie(Cookie::forever('visited_welcome', '1'));
}

try to except your cookie in app\Http\Middleware\EncryptCookies.php

class EncryptCookies extends Middleware
{
    /**
     * The names of the cookies that should not be encrypted.
     *
     * @var array
     */
    protected $except = [
        'visited_welcome'
    ];
}